import React from 'react'

import Square from '../Square';

class Board extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      status: 'Next Player: X',
      squares: Array(9).fill(null),
      isCircle: true
    }
  }
  handleClick(i) {
    console.log(i);
    const { isCircle, squares } = this.state
    const winner = this.calculateWinner(squares)
    if (winner || squares[i]) {
      return;
    }
    const tmpSquares = squares
    tmpSquares[i] = (isCircle ? '○' : 'x')
    this.setState({
      squares: tmpSquares,
      isCircle: !isCircle
    })
  }
  renderSquare(i) {
    return <Square value={this.state.squares[i]} onClick={() => this.handleClick(i)}></Square>
  }

  // 判断胜负
  calculateWinner(squares) {
    const lines = [
      [0, 1, 2],
      [3, 4, 5],
      [6, 7, 8],
      [0, 3, 6],
      [1, 4, 7],
      [2, 5, 8],
      [0, 4, 8],
      [2, 4, 6],
    ];
    for (let i = 0; i < lines.length; i++) {
      const [a, b, c] = lines[i];
      if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
        return squares[a];
      }
    }
    return null;
  }

  render() {
    const winner = this.calculateWinner(this.state.squares)
    let status
    if (winner) {
      status = 'Winner is:' + winner
    } else {
      status = 'Next Player: ' + (this.state.isCircle ? 'X' : 'Y')
    }

    return (
      <div>
        <div className="status">{status}</div>
        <div className="border-row">
          {this.renderSquare(0)}
          {this.renderSquare(1)}
          {this.renderSquare(2)}
        </div>
        <div className="border-row">
          {this.renderSquare(3)}
          {this.renderSquare(4)}
          {this.renderSquare(5)}
        </div>
        <div className="border-row">
          {this.renderSquare(6)}
          {this.renderSquare(7)}
          {this.renderSquare(8)}
        </div>
      </div>
    )
  }
}

export default Board